Apparatus for burning gas.



N. THOMAS & A. W. ALLEN. APPARATUS FOR BURNING GAS. APPLICATIQN FILED-JULY I0. 1914.

Patented Feb. 15,1916.

2 SHEETS-SHEET I- N. THOMAS 6L A. w. ALLEN.

APPARATUS FOR BURNING GAS.

APPLICATION FILED JULY 10, I914.

Patented Feb. 15,1916.

2 SHEETSSHEET 2- 7 I IELSON 'IHQMAS AND ANSON ,W. ALLEN, OF BIRMINGHAM, ALABAMA,

APPARATUS FOR BURNING GAS.

ments in Apparatus for Burning Gas, of

of a gas pipe,

which the following is a specification.

Our invention relates to-a gas burning device, and particularly to a It has not heretofore been found possible or practicable to employ by-product gas in open hearth furnaces. By the term byproduct gas we refer to gas evolved in the making of coke from coal in retort ovens. The reasons for the impracticability of burning this gas may possibly relate more to the lack of adequate facilities in the construction of the open hearth furnaces than to the character of the gas itself. We have found, however, that such gas may be burned in open hearth furnaces to advantage and without materially altering the port constructionof the furnaces.

In the utilization of by-product gas it has been found essential to highly heat the same in order to secure complete and speedy combustion. We accomplish this result in the present instance by constructing the furnace with a main and auxiliary air flue, the gas being supplied to the auxiliary flue by means which was pipe terminates short of the mouth leaving a space within which primary combustion may take place. By such mechanism we are enabled to cause partial combustion of the gas, that is combustion to the extent permitted by the limited volume of air in the auxiliary flue, thushighly heating the remainder of the gas, which is ejected into the larger space and mixed with the required volume of air to cause complete and speedy combustion.

he invention will be more readily understood by reference to the accompanying drawings, where-'- Figure 1 is a longitudinal vertical section through an end of a tilting open hearth furnace, towhich our invention has been applied, Fig. 2 is a'transverse section on the line 22 on Fig. 1, and Fig.3 is a section on the line 33 of Fig. 1.

Referring more particularly to the drawings, it will be seen that we provide an open hearth furnace 10, which in the present in- Specification of Letters Patent.

burner adapted for use in an open hearth furnace.

of the auxiliary flue, thus complete combustion takes place.

Patented Feb. 15, 1916'.

Application'filed July 10, 1914. Serial No. 850,131.

' stance is of the tilting type. The end construction consists in an end wall 11, a lower wall 12 and an upper wall 13, within which walls is provided a main air flue 14 and an auxiliary air flue 15. The main air flue is divided as shown in-Fig. 2, the two portions uniting at a point above the division arch 16, the auxiliary flue extending underneath the arch 16. In View of the fact that when the furnace is reversed the heat around the arch 16 is very eat, we prefer to provide within the arch t e longitudinally extending Water-cooled boxes 17, laid, as shown in Fig. 2, with their sides in engagement, thus forming a-self-supporting arch. Water is supplied to these boxes by means of the pipe 18.

Extending into the auxiliary flue 15 is a gas pipe 19, surrounded by a further pipe 20, between which pipes waterv may be circulated to preventoverheating. Gas is sup-' plied to the pipe 19 by the main 21, having a valve 22 therein, by means of which the supply is controlled. Located centrally 7 gas pipe by .means of a bend 24: in the air plpe as shown.

It will be noted that the gas pipe is terminated short of the nose of the arch 16,

thus leaving a space 25 which acts as a combustion chamber of limited volume, the walls of which chamber are constricted near the mouth of the chamber, as best shown in'Figs. 1 and 3. By, tapering the of reduced cross-section, we are better able to control the direction of the flame.

, Within this chamber 25 initial combustion takes place, that is such combustion as is possible in view of the limited volume of oxygen present. This combustion, however, highly heats the unconsumed gas and this is delivered into the main combustion space at the conflux of the two flues, where The dichamber and making the mouth thereof of rection of the flame is controlled to acertain extent by means .of the high pressure air pipe 23. This, taken in connect on with the tapering ofthe walls of the-chamber 25, enablesus to utilize a very high degree of heat without directing the flame against the roof" or side walls of the open'hearth furnace. It will be understood, of

course, that the l air supply through the flues 14:, 15 may or may not be regenerated, as desired, preferably, however, it will be highly heated by passing through regenerators, as is customary in the operation of such furnaces.

We claim:

1. In a burner for open hearth furnaces, the combination of a pipe projecting inwardly from the rear wall of the burner, a second pipe surrounding said first pipe and providing a Water space between said pipes, inlet and outlet water connections to said space, a gas connection to said inner pipe, athird small pipe located internally of said inner pipe and terminating short of the mouth thereof, means for maintaining said small pipe in axial alinement with the pipe in which it is held, means for supplying high pressure air to said small pipe and additional means for supplying air around the gas pipe, substantially as described.

2. In a gas burning device for open hearth furnaces, the combination of a large conduit and a small conduit, each of which is adapted to supply air, said conduits uniting at the point of discharge, a watercooled gas pipe located in said smaller conduit and projected inwardly from the end Wall of the device and terminating short of the mouth of said smaller conduit and substantially midway in the length thereof, and a small high-pressure air pipe located internally of said gas pipe and terminating short of the mouth of said gas pipe, substantially as described.

In Witness whereof We have hereunto set our names in the presence of two subscrib- NELSON THOMAS. ANSON W. ALLEN. Witnesses:

J. V. CALVIN, En Wim'rsn. 

